Coloured coated steel sheet is a product made of cold rolled steel sheet, plated galvanized steel sheet, hot galvanized steel sheet or aluminized galvanized steel sheet, after degreasing, phosphating and complexing treatment, coated with organic paint and baked.
The commonly used coatings for color coated steel plate are polyester (PE), followed by silicone modified resin (smp), high weather resistant polyester (hdp), polyvinylidene fluoride (pvdf), etc. The coatings structure is divided into two coatings, one baking and two baking. The thickness of coatings is generally 20-25u on the surface, 8-10u on the back, and should not be lower than 20u on the outside and 10u on the back. The commonly used standards for color coated steel sheets are ASTM a527 (galvanized), ASTM at92 (galvanized), JIS g3302 of Japan, en/0142 of Europe, KS d3506 of Korea and q/bqb420 of Baosteel.
* polyester (PE)
Good adhesion, wide range of formability and outdoor durability, moderate chemical resistance. The service life is 7-10 years.
* silicone modified resin (smp)
The film has good hardness, wear resistance and heat resistance, as well as good external durability and non-pulverization, gloss retention and flexibility are limited. The service life is 10-15 years.
* high weather resistant polyester (hdp)
It has excellent ultraviolet resistance and high durability. Its main properties are between polyester and fluorocarbon. The service life is 10-12 years.
It has good formability and color retention, excellent outdoor durability and pulverization, solvent resistance, and limited color. The service life is 20-25 years.
Coloured coated profiled steel sheet, commonly known as coloured steel sheet, is based on high-quality cold-rolled steel sheet, hot-dipped galvanized steel sheet or aluminized galvanized steel sheet. After degreasing, phosphating and chromate treatment, it is coated with organic coating and baked. It has the characteristics of light weight, high strength, bright colour and good durability. It is widely used in construction, household appliances, decoration, automobile and other fields.
The strength of the color steel plate depends on the substrate material and thickness, and the durability depends on the coating (318g/m2 galvanizing amount) and the surface coating. The coating includes polyester, silicone resin, fluorine resin, etc. The thickness of the coating is more than 25um. The coating structure has two coatings, one baking and two baking. The maintenance-free service life can be 20-30 years depending on the ambient atmosphere.